Even then, his fathers death becomes about him unable to save everyone with his powers, something that will undoubtedly be called back up later on in the film...

Well, Clark/Superman is the protagonist - the story is about him. Jonathan is a supporting character.

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...not only does it trivialise such an important character moment into a plot point, it's just so expected.

Until we see the movie, we can’t say how certain events will be handled - emotional or "trivialized" . But an accidental death isn’t intrinsically less meaningful than a natural one (both are tragic). In terms of being “expected,” I dunno. Traditionally, Jonathan dies by natural causes or he doesn’t die at all. An accidental death (that Clark might have prevented if not for saving others) is relatively novel.